Kyren Legate {1}{R}
Creature — Goblin
If an opponent controls a Plains and you control a Mountain, you may cast this spell without paying its mana cost.
Haste
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Cards that do something similar expected a card that isn't here?
Reports become test cases the matcher is graded against before an update ships. Delvefall isn't a chatbot guessing, it compares the printed rules text of every card with plain math, and examples like yours decide which differences should count.
Sivvi's Ruse 99%
$0.19#26312
"If an opponent controls a Mountain and you control a Plains, you may cast this spell without paying its mana cost."
Saprazzan Legate 87%
$0.41#19978
"If an opponent controls a Mountain and you control an Island, you may cast this spell without paying its mana cost."
Mogg Salvage 84%
$0.24#6528
"If an opponent controls an Island and you control a Mountain, you may cast this spell without paying its mana cost."
Massacre 80%
$1.86#11190
"If an opponent controls a Plains and you control a Swamp, you may cast this spell without paying its mana cost."